Takemichi Hanagaki leads a hollow, dead-end life until the news of his middle-school sweetheart’s murder by the ruthless Tokyo Manji Gang shatters his spirit. A sudden brush with death on a subway platform thrusts him twelve years into the past, returning him to his delinquent heyday with a desperate chance to rewrite history. To save the girl he loves, Takemichi must infiltrate the very gang that will eventually become a criminal empire, navigating a violent landscape of brutal street brawls and shifting loyalties. He constantly grapples with his own deep-seated cowardice and the crushing weight of his past failures, realizing that altering the timeline requires more than just foresight—it demands a total transformation of his character. Discovering that he can leap between eras by shaking hands with his girlfriend’s brother, he enters a high-stakes race against time where every decision in the past ripples into a dangerous new present. Amidst the charismatic but deadly leaders of the gang, he faces the manipulative machinations of rivals who thrive on betrayal. Takemichi will stop at nothing to climb to the top and seize a future where his friends survive and the woman he adores is finally safe.